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Numerical Simulations of Electromigration and Stress Migration Driven Void Propagation in Pb Free Solder Interconnects

[+] Author Affiliations
Subramanya Sadasiva, Ganesh Subbarayan

Purdue University, West Lafayette, IN

Lei Jiang, Daniel Pantuso

Intel Corporation, Portland, OR

Paper No. IPACK2011-52230, pp. 585-590; 6 pages
  • ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems
  • ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 1
  • Portland, Oregon, USA, July 6–8, 2011
  • ISBN: 978-0-7918-4461-8
  • Copyright © 2011 by ASME


Increasing miniaturization has led a significant increase in the current densities seen in flip-chip solder joints. This has made the study of failure in solder joints by void propagation due to electromigration and stress migration more important. In this study, we develop a phase field model for the motion of voids through a flip chip solder interconnect. We derive equations of motion for the void accounting for energetic contributions from the active factors of surface energy, stress and electric potential, taking into account both surface diffusion and transfer of the material through the bulk of the material. We describe the implementation of this model using finite elements, coupled with a commercial finite element solver to solve for the fields driving the void motion.

Copyright © 2011 by ASME



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